If you need to fight a Squirtle, the use the following chart (the number in the parenthesies - the actual damage/physuical damage without weakness/resistance ratio: multiply the number by the base damage of the move and the attack/special attack of the attacking Pokemon - and the bigger the result, the more damage the move will do):

Pokédex data

Naturally learnt attacks

These are attacks which are learnt naturally by Squirtle — that is, learnt without the use of a TM or HM (automatically learned once they reach a certain level).

The rows entitled with acronyms are used to identify at what level the Pokémon learns that attack in that game. For example, if the number "7" was in a row entitled RGB beside an attack named "Foobar", than that Pokémon would learn the attack "Foobar" at level seven in Pokémon Red, Blue, and Green.

Any attacks which are learned at "Catch" means that they already know that attack when they are caught, or learn it before evolving into this form. N/A means that that attack is not learnable in that game. Any attacks which are learned a "Evolve" are learned when they evolve.